Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfccbdb89d6b5baa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 09:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8729acc9e1367678da1d3d06ea4f0bca SHA-1: db039385b6608b63480c7305d5805766dc1cce53 SHA-256: bfccbdb89d6b5baa9c1b6719ad186f72c9a63cd72523f57ab851c1678b98d6f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised websites and potentially leading them to download further malicious content. The presence of a 'Remote-support tool lure' heuristic indicates the document may instruct users to install or connect with remote access software, a common tactic for phishing or social engineering attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=vw+polo+2010+wiring+diagram+pdf PDF link annotation
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/98231144490.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/512cadeb3bc66a9d36816863568fc0ab/39534256197.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/63e113cf1ca33de908ba72419cfd2830/luvijapedidovilopalez.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/mufedufulewekumur.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/09d093778e346e828c25249eb60c50b2/lokuzamavivafunapikeba.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5af099f9f---witobakubowajuxijoguzo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/tekapetaxa.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/26826474648.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a2b91651e---10436255848.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zotobefevome.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a94b29003442a6ff0f6d784475c03b8d/27442277438.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/af57ff056d1f84f894de042f35749a3d/74328082967.pdfIn PDF document text
    • http://cabini.it/userfiles/files/kevuvanaxedegapije.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/89173308767.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0c3cb6453207090b9a1b661a9f77c07d/wopexakupa.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tevewesefotugazanisug.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/22486817296.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/gevepuvoji.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef4d3551f---1818883530.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jekepopabij.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/5191730731.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/99303410798.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/kubexibakojuvab.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160caab7169c24---37359866422.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 18356 bytes
SHA-256: 8e96a44d672f3bef0390f1407a7ea6f963f7f9c86465abf81e59ae435a31d078
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10792 bytes
SHA-256: bc49f4b4022444104664a3e95c2a5a86cbfa5ad0965188b7aefbd67cd504f4a1

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